Python re question

Question

import re
>>> curr = '1'
>>> for each in range(30):
... match = re.findall("(\d)(\\1*)",curr)
... curr = "".join([str(len(k+y))+k for k,y in match])
...
>>> print len(curr)
\\ 1,11,21,1211,111221, ...
\\ 5808
In this program,what does the "(\d)(\\1*)" mean???

Answer 1

I thought we got that covered ;)
https://www.sololearn.com/discuss/344854/?ref=app